I ended up in a chemistry department for my Ph.D., so I'm not going to post my GRE and GPA as it might inspire false hope for those of you planning on going to grad school for bio (and related areas).

Not that I did horribly, but I was a B/B+ sort of student and my GRE scores were somewhere in the low 90th percentiles overall (I was one of the first people to take it electronically as memory serves, which I firmly claim had a deleterious effect on my overall score.). I would not recommend being comfortable with your stats if they're similar to mine and you're planning on applying to highly ranked bio/biochem programs. I did however have a stellar letter of recommendation from my undergrad research advisor, who knew I could run the EPR spectrometer and optical bench well enough to teach new postdocs, as well as enough biochemistry to keep major lab projects running on my own.
My formal mathematics background ended with differential equations, so keep that in mind. I would say, in very general terms, selection of reach schools has to be done with some degree of wisdom in mind. Do you happen to know if one of your recommenders has a close friend/former coworker/former fellow student on the faculty at that school? My impression (which I think most people will agree with me on, to one degree or another) is that letters of recommendation carry more weight if they're written by someone that is a known quantity. For example, when I had visits at a few schools during my recruitment spring (that time between February and early April when departments wine and dine prospective visiting graduate students), I had a few faculty at each school ask me how my undergrad research advisor was doing as they were all chummy with him in one way or another (they used to collaborate, they always see each other at conferences, etc. etc.). I realize this all sounds a bit Machiavellian, but I think about it like this. If I were to run my own lab/research group one day, and I have one person who's interested in joining and has decent creds and recommendations, and another person who's interested in joining and has decent creds and a good recommendation from someone I personally know who is an excellent scientist, I'm probably going to think very hard and long about the latter person.
Another thing to think about is that I'm presuming you have obvious areas of particular interest as can be seen in your past research experience and from your application essays. You may want to consider focusing your applications to reach schools which have a strong core group of faculty in those areas, as they might be more amenable to taking you on.
Disclaimer: This is all very general advice, I take no responsibility for graduate school rejections that you may experience. Almost everyone gets dinged somewhere along the way. (Those that don't, well, good for you.) Sometimes it's for the best. I had a major crush on this one school I applied to for grad school. Like, if you had given me a choice between getting into there or having Natalie Portman confess her undying and eternal love for me, I would have picked an acceptance letter over Natalie. As it turned out, my grad school advisor worked as a postdoc for the PI in whose lab I would have likely ended up, and I realized - as I became more familiar with the field - that I ended up in a better place.